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Alcohol
R-O-H (hydroxy group)

Aldehyde
C=O (carbonyl group with hydrogen

Alkane
single bond (not functional group)

Alkene
double bond

Alkyne
triple bond

Amide
-CONH2, -CONHR, -CONR2

Amine
-NH2 (amino group)

Carboxylic acid
O=C-OH

Ester
O=C-OR

Ether
R-O-R (alkoxy group)

Ketone
-C=O (carbonyl group)

Aldehyde

hydroxyl
R-O-H

Carbonyl
C=O

Nitrile
C triple bond N

Ketone
O=C-R

Meth-
1 carbon atom
Eth-
2 carbon atoms
Pro-
3 carbon atoms
But-
4 carbon atoms
Pent-
5 carbon atoms
Hex-
6 carbon atoms
Iso-
branch
Cyclo-
ring